kc3-lang/angle/src/compiler/DirectiveHandler.cpp

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• Author : alokp@chromium.org
  Date : 2012-06-19 18:48:05
  Hash : 73bc298e
  Message : Hooked up the new preprocessor behind a compile-time flag ANGLE_USE_NEW_PREPROCESSOR. Review URL: https://codereview.appspot.com/6304095 git-svn-id: https://angleproject.googlecode.com/svn/trunk@1158 736b8ea6-26fd-11df-bfd4-992fa37f6226

• src/compiler/DirectiveHandler.cpp

• //
  // Copyright (c) 2012 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  #include "compiler/DirectiveHandler.h"
  
  #include <sstream>
  
  #include "compiler/debug.h"
  #include "compiler/Diagnostics.h"
  
  static TBehavior getBehavior(const std::string& str)
  {
      static const std::string kRequire("require");
      static const std::string kEnable("enable");
      static const std::string kDisable("disable");
      static const std::string kWarn("warn");
  
      if (str == kRequire) return EBhRequire;
      else if (str == kEnable) return EBhEnable;
      else if (str == kDisable) return EBhDisable;
      else if (str == kWarn) return EBhWarn;
      return EBhUndefined;
  }
  
  TDirectiveHandler::TDirectiveHandler(TExtensionBehavior& extBehavior,
                                       TDiagnostics& diagnostics)
      : mExtensionBehavior(extBehavior),
        mDiagnostics(diagnostics)
  {
  }
  
  TDirectiveHandler::~TDirectiveHandler()
  {
  }
  
  void TDirectiveHandler::handleError(const pp::SourceLocation& loc,
                                      const std::string& msg)
  {
      mDiagnostics.writeInfo(pp::Diagnostics::ERROR, loc, msg, "", "");
  }
  
  void TDirectiveHandler::handlePragma(const pp::SourceLocation& loc,
                                       const std::string& name,
                                       const std::string& value)
  {
      static const std::string kSTDGL("STDGL");
      static const std::string kOptimize("optimize");
      static const std::string kDebug("debug");
      static const std::string kOn("on");
      static const std::string kOff("off");
  
      bool invalidValue = false;
      if (name == kSTDGL)
      {
          // The STDGL pragma is used to reserve pragmas for use by future
          // revisions of GLSL. Ignore it.
          return;
      }
      else if (name == kOptimize)
      {
          if (value == kOn) mPragma.optimize = true;
          else if (value == kOff) mPragma.optimize = false;
          else invalidValue = true;
      }
      else if (name == kDebug)
      {
          if (value == kOn) mPragma.debug = true;
          else if (value == kOff) mPragma.debug = false;
          else invalidValue = true;
      }
      else
      {
          mDiagnostics.report(pp::Diagnostics::UNRECOGNIZED_PRAGMA, loc, name);
          return;
      }
  
      if (invalidValue)
        mDiagnostics.writeInfo(pp::Diagnostics::ERROR, loc,
                               "invalid pragma value", value,
                               "'on' or 'off' expected");
  }
  
  void TDirectiveHandler::handleExtension(const pp::SourceLocation& loc,
                                          const std::string& name,
                                          const std::string& behavior)
  {
      static const std::string kExtAll("all");
  
      TBehavior behaviorVal = getBehavior(behavior);
      if (behaviorVal == EBhUndefined)
      {
          mDiagnostics.writeInfo(pp::Diagnostics::ERROR, loc,
                                 "behavior", name, "invalid");
          return;
      }
  
      if (name == kExtAll)
      {
          if (behaviorVal == EBhRequire)
          {
              mDiagnostics.writeInfo(pp::Diagnostics::ERROR, loc,
                                     "extension", name,
                                     "cannot have 'require' behavior");
          }
          else if (behaviorVal == EBhEnable)
          {
              mDiagnostics.writeInfo(pp::Diagnostics::ERROR, loc,
                                     "extension", name,
                                     "cannot have 'enable' behavior");
          }
          else
          {
              for (TExtensionBehavior::iterator iter = mExtensionBehavior.begin();
                   iter != mExtensionBehavior.end(); ++iter)
                  iter->second = behaviorVal;
          }
          return;
      }
  
      TExtensionBehavior::iterator iter = mExtensionBehavior.find(name);
      if (iter != mExtensionBehavior.end())
      {
          iter->second = behaviorVal;
          return;
      }
  
      pp::Diagnostics::Severity severity = pp::Diagnostics::ERROR;
      switch (behaviorVal) {
        case EBhRequire:
          severity = pp::Diagnostics::ERROR;
          break;
        case EBhEnable:
        case EBhWarn:
        case EBhDisable:
          severity = pp::Diagnostics::WARNING;
          break;
        default:
          UNREACHABLE();
          break;
      }
      mDiagnostics.writeInfo(severity, loc,
                             "extension", name, "is not supported");
  }
  
  void TDirectiveHandler::handleVersion(const pp::SourceLocation& loc,
                                        int version)
  {
      static const int kVersion = 100;
  
      if (version != kVersion)
      {
          std::stringstream stream;
          stream << version;
          std::string str = stream.str();
          mDiagnostics.writeInfo(pp::Diagnostics::ERROR, loc,
                                 "version number", str, "not supported");
      }
  }